NORMAN, Okla. (AP) — Before the first thunderstorm even formed over Oklahoma, forecasters were using ominous language to describe violent weather they’re expecting.

The Storm Prediction Center on Friday labeled a tornado watch as a “particularly dangerous situation,” language set aside for the worst storm systems. Forecasters are predicting numerous tornadoes, including several strong ones. Hail could be the size of grapefruits — 4 inches in diameter.

Bad weather is also expected in parts of southeastern Kansas and southwestern Missouri, but meteorologists reserved the strongest terms for Oklahoma. No storms had formed by 4 p.m, but forecasters said that once they do, they’re likely to become severe quickly.

The tornado watch area includes Moore, Okla., where 24 people died in a May 20 storm. The Oklahoma City and Tulsa are included, too.